In between they tried 6 small roadwheels on the T-64. While they never changed them on those tanks, they never used that pattern again so I can bet it wasn't especially successful.Yep, it's a T-72. The T-55 and T-62 both had 5 main road wheels, albeit with different spacing. The T-72 has 6 large road wheels.
Roadwheel number & spacing is one of the best tells of which tanks are which till you get to the T-80/T-90 era.